Newtons First Law of Motion :Inertia
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While ice skating with your friend , you push off from one end of the rink and slide forward. Based on Newtons first law of motion, what is true?
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You will continue to slide across the ice until a force makes you stop or change directions
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How is velocity different from speed?
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Velocity is speed and direction together
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What does friction do to a moving object?
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Slow it down
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Your friend kicks a soccer ball, and it stops a few feet from you. What needs to happen to it in order for it to return to your friend?
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Force has to be applied to the ball
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What is the relationship between heavy objects and inertia?
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Heavy objects have more inertia
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You are riding in the car with your grandfather, and he turns left. Why do you shift to the right?
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It takes you a while to catch up with the new velocity of the car
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What does the second part of newtons law say about objects at rest?
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They will stay at rest unless acted on by an outside force
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Which of these can cause a moving object to change direction?
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Force
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What is gravitational force?
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The force of attraction between ant two objects
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What is an objects center of gravity ?
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The exact center of its mass
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A paperclip and a computer are sitting on your desk. What is true about the gravitational force of these two objects?
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The computer and the paper clip attract with equal gravitational force
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Why don't we see the ground coming toward us?
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We have less mass than the Earth
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:Why doesn't the moon crash into the earth?
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It has lots of mass, so it feels the Earths gravitational force less than smaller objects
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Why is it impossible to defy gravity?
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Gravitational force exists every place where there are two objects
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Firefighters use ___ to control how fast they fall.
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friction
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Friction can turn work into ____.
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heat
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Friction is what holds all ___ together. (Like on your shoelaces!)
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knots
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Your __ help you pick up objects. The ridges on them help you grab the objects.
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fingers
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People wear __ or cleats when playing sports so that they can get more (friction), making it easier to stop.
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spikes
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Hockey skates side because they make a layer of liquid __ between the skate and the ice. This creates very little fiction between the skate and the ice.
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water
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Would dancing be possible without friction?
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No
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When you are on a bike, friction is what holds your __ on the pedals
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feet
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Even though a bowling __ is smooth and the alley is smooth, there is still (friction) between them
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ball
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To get something as __ and heavy as a train moving, we use (friction) to get it going.
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big
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When a spacecraft reenters Earth's atmosphere, friction causes the outside of the spacecraft to get extremely __.
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hot
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Our joints are ___ to reduce wear and tear on our bones.
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packed
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Slugs produce ___ to help reduce the friction between the animal's body and the ground.
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mucus
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Airplanes have smooth shapes to reduce __.
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drag
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A world without friction would be ___
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dangerous
